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significant difficulties (reverso.net kee46); odds (difficulties which make a good result seem very unlikely (The soldiers’ job was to hold on despite impossible odds)  ldoceonline.com dreamjam) | |||
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| real challenge (Driving becomes a real challenge during Vancouver's darkest and rainiest months. ART Vancouver) | |||
| серьёзные трудности: 13 phrases in 4 subjects |
| Chess | 1 |
| General | 6 |
| Makarov | 4 |
| Scientific | 2 |